Does it work on Safari or Firefox?

Auto-scroll works in any modern browser. Voice-following relies on browser speech recognition, which is most reliable in Chrome and other Chromium browsers.

Does it work on a phone?

Yes — a phone propped near your camera is a common setup.

Guides

Requirements

letter maps runs in the browser, so there's nothing to download. Here's what each mode needs.

For voice-following

A browser with speech recognition — Chrome or another Chromium-based browser works best.
A working microphone, built-in or external.
Microphone permission when the browser asks.
An internet connection, unless you're using on-device recognition.

For on-device (offline) voice

Chrome 139 or newer.
On-device recognition enabled in settings.
A one-time language-model download the first time you use a language.

For auto-scroll

Any modern browser — no microphone needed.
Works offline once the page has loaded.

Check it on your device →

Frequently asked questions

Does it work on Safari or Firefox?: Auto-scroll works in any modern browser. Voice-following relies on browser speech recognition, which is most reliable in Chrome and other Chromium browsers.
Does it work on a phone?: Yes — a phone propped near your camera is a common setup.